Cause this unit is just an universal unit, it does not support the factory amplifier and output some special low frequency audio, you can enter the EQ to adjust the Effect to Jazz or Rock, then you will get the mid and low frequency audio.
About the "Speed" button, when you touch it, the unit will automatically erase some trace and clear up large occupation memory of some apps, this makes the unit run more smooth and fast.
With respect of your issue, it maybe the system error, could you please tell us your current system version?
If we have the new firmware, we can send it to you, then you can try to install it to check.
RegardsStatistics: Posted by Jammy — Mon Jul 11, 2016 6:21 am
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